Malicious PDF — malware analysis report

Static analysis result for SHA-256 812d8128b6ace7e8…

MALICIOUS

PDF

124.6 KB Created: 2021-08-05 05:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99dfcaa07f316eeb9c80a0acd7371323 SHA-1: 36e81ccd96c892a0c209b38d240c599d0fa2b3ce SHA-256: 812d8128b6ace7e8f762f3f00b31ae06c881de758211b123095e5c7af3fbe9db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=social+problems+macionis+pdf PDF link annotation
    • https://vieclamhanoi247.com/upload/files/tavilabokaxamuni.pdfIn PDF document text
    • https://network-italia.com/file/lojilisazukozus.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/sovukavonimilitigu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gujexafutodukijupotaveluk.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/34725689195.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l54tpqbm0a2f7mkc71sbf9db1m/58967392289.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ce011f1fec8---tuvezare.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e141e4a13e32173c94bbbf8225d9e0f5/86293304417.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/69106622161.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625255188samaluvobaxoxamovulum.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/db722313d5ced4a81f63fa93be9ff2ae/rolugedisezedamudemodobi.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nevatopawazupojamelafe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610768908adb4---62952725657.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9be2c8003---jitorovenapixi.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/31616250004.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/53773625273.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nenikejerita.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/gikofo.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210510041430.pdfIn PDF document text
    • https://schmitz.cz/res/file/42147902694.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66517d4310---48139763957.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2c992f84beba2c1e52891281eeefab45/niluganozovilidasufodo.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/eutp8iojkku84cuejbn6mg8es8/99742169017.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18402 18308 bytes
SHA-256: 953f08c0e8a6e884e6e3470ae4c9a3171d204277c4790f2b711de2ef46ae5974
font_01_sfnt_off0001b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAD0 10896 bytes
SHA-256: 87b053aa7168a001ddd639cdb72752acfc8b3a3ebdf76fb991d5bd03103e7c9f

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